Allowances for Loan Losses - Summary of Aging Analysis of the Recorded Investment of Past-Due Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Financing Receivable, Past Due [Line Items]
Total Loans	$ 415,807	$ 328,247
Total > 90 Days and Accruing	0	97
Commercial and industrial [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	129,835	101,370
Total > 90 Days and Accruing	0	0
Construction and land development [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	25,177	20,935
Total > 90 Days and Accruing	0	0
Real estate - commercial [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	193,488	145,800
Total > 90 Days and Accruing	0	0
Real estate - residential [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	41,891	37,302
Total > 90 Days and Accruing	0	97
Real estate - home equity [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	21,987	20,218
Total > 90 Days and Accruing	0	0
Consumer [Member]
Financing Receivable, Past Due [Line Items]
Total Loans	3,429	2,622
Total > 90 Days and Accruing	0	0
30-59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	4,807	1,201
30-59 Days Past Due [Member] | Commercial and industrial [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	1,878	10
30-59 Days Past Due [Member] | Construction and land development [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	0	0
30-59 Days Past Due [Member] | Real estate - commercial [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	2,779	480
30-59 Days Past Due [Member] | Real estate - residential [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	150	711
30-59 Days Past Due [Member] | Real estate - home equity [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	0	0
30-59 Days Past Due [Member] | Consumer [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	0	0
60-89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	239	719
60-89 Days Past Due [Member] | Commercial and industrial [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	0	0
60-89 Days Past Due [Member] | Construction and land development [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	0	0
60-89 Days Past Due [Member] | Real estate - commercial [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	0	0
60-89 Days Past Due [Member] | Real estate - residential [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	225	719
60-89 Days Past Due [Member] | Real estate - home equity [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	0	0
60-89 Days Past Due [Member] | Consumer [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	14	0
90 Days or Greater Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	0	289
90 Days or Greater Past Due [Member] | Commercial and industrial [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	0	0
90 Days or Greater Past Due [Member] | Construction and land development [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	0	0
90 Days or Greater Past Due [Member] | Real estate - commercial [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	0	156
90 Days or Greater Past Due [Member] | Real estate - residential [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	0	133
90 Days or Greater Past Due [Member] | Real estate - home equity [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	0	0
90 Days or Greater Past Due [Member] | Consumer [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	0	0
Total Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	5,046	2,209
Total Past Due [Member] | Commercial and industrial [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	1,878	10
Total Past Due [Member] | Construction and land development [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	0	0
Total Past Due [Member] | Real estate - commercial [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	2,779	636
Total Past Due [Member] | Real estate - residential [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	375	1,563
Total Past Due [Member] | Real estate - home equity [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	0	0
Total Past Due [Member] | Consumer [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	14	0
Current [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	410,761	326,038
Current [Member] | Commercial and industrial [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	127,957	101,360
Current [Member] | Construction and land development [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	25,177	20,935
Current [Member] | Real estate - commercial [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	190,709	145,164
Current [Member] | Real estate - residential [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	41,516	35,739
Current [Member] | Real estate - home equity [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	21,987	20,218
Current [Member] | Consumer [Member]
Financing Receivable, Past Due [Line Items]
Loans, Gross	$ 3,415	$ 2,622